videos in AudioSet
A list of about a million ten-second YouTube clips, each labelled with the sounds in it, that Google published in 2017. Labs use it to train and test general audio and music models.
Including The Final Countdown: Dueling Cellos by Nathan Chan and Stephanie Tsai, Counting Stars - OneRepublic | Nathan Chan and Space Among Many, Super Mario Bros. for Violin and Cello by Nathan Chan and Alex Fager